Category: bromides-buliding-blocks

Wu, Chongyang; Ying, Tao; Yang, Xinjie; Su, Weike; Dushkin, Alexandr V.; Yu, Jingbo published their research in Organic Letters in 2021. The article was titled 《Mechanochemical Magnesium-Mediated Minisci C-H Alkylation of Pyrimidines with Alkyl Bromides and Chlorides》.Formula: C4H7Br The article contains the following contents:

A novel method to synthesize 4-alkylpyrimidines by the mechanochem. magnesium-mediated Minisci reaction of pyrimidine derivatives and alkyl halides was reported. The reaction process operated with a broad substrate scope and excellent regioselectivity under mild conditions with no requirement of transition-metal catalysts, solvents, and inert gas protection. The practicality of this protocol was demonstrated by the up-scale synthesis, mechanochem. product derivatization and preparation of the antimalarial drug pyrimethamine. In the experiment, the researchers used (Bromomethyl)cyclopropane(cas: 7051-34-5Formula: C4H7Br)

(Bromomethyl)cyclopropane(cas: 7051-34-5) is used as a synthetic building block for the introduction of the cyclopropylmethyl group. It was also used in the synthesis of 1,4-dienes via iron-catalyzed cross-coupling with alkenyl Grignard reagents.Formula: C4H7Br

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Cruz, Cole L.; Montgomery, John published their research in Chemical Science in 2021. The article was titled 《Nickel-catalyzed reductive coupling of unactivated alkyl bromides and aliphatic aldehydes》.Application In Synthesis of Ethyl 3-bromopropanoate The article contains the following contents:

A mild, convenient coupling of aliphatic aldehydes e.g., BnCH2CHO and unactivated alkyl bromides e.g., Br(CH2)3C(O)OEt has been developed. The catalytic system features the use of a common Ni(II) precatalyst and a readily available bioxazoline ligand and affords silyl-protected secondary alcs. e.g., BnCH2CH(OTES)(CH2)3C(O)OEt. The reaction is operationally simple, utilizes Mn as a stoichiometric reductant, and tolerates a wide range of functional groups. The use of 1,5-hexadiene as an additive is an important reaction parameter that provides significant benefits in yield optimizations. Initial mechanistic experiments support a mechanism featuring an alpha-silyloxy Ni species that undergoes formal oxidative addition to the alkyl bromide via a reductive cross-coupling pathway. In addition to this study using Ethyl 3-bromopropanoate, there are many other studies that have used Ethyl 3-bromopropanoate(cas: 539-74-2Application In Synthesis of Ethyl 3-bromopropanoate) was used in this study.

Ethyl 3-bromopropanoate(cas: 539-74-2) belongs to organobromine compounds.Most of the natural organobromine compounds are produced by marine organisms , and several brominated metabolites with antibacterial , antitumor , antiviral , and antifungal activity have been isolated from seaweed, sponges, corals, molluscs, and others. Moreover, several studies demonstrate that the average proportion of bromine in drugs is significantly higher than that in natural products. Application In Synthesis of Ethyl 3-bromopropanoate

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Wang, Siyuan; Zhou, Yangkun; Huang, Hanmin published their research in Organic Letters in 2021. The article was titled 《Palladium-Catalyzed Tandem Carbonylative Diels-Alder Reaction for Construction of Bridged Polycyclic Skeletons》.Electric Literature of C8H7BrO2 The article contains the following contents:

A palladium-catalyzed tandem carbonylative lactonization and Diels-Alder cycloaddition reaction between aldehyde-tethered benzyl halides I (R1 = H, X = Cl, Br; R1 = 4-Cl, 3-Br, 5-MeO, etc., X = Br) and alkenes R2R3C:CHR4 [R2 = H, n-BuO, ClCH2CH2O, BocNH, Ph, 2-MeC6H4, 4-ClC6H4, etc., R3 = R4 = H; R2 = Ph, R3 = Me, R4 = H; R2R4 = OCH2CH2, (CH2)3, (CH2)6; etc.] has been developed. A range of alkenes and aldehyde-tethered benzyl halides bearing different substituents can be successfully transformed into the corresponding bridged polycyclic compounds II in good yields. This strategy provides a unique approach to complex lactone-containing bridged polycyclic compounds In the part of experimental materials, we found many familiar compounds, such as 3-Bromo-2-methylbenzoic acid(cas: 76006-33-2Electric Literature of C8H7BrO2)

3-Bromo-2-methylbenzoic acid(cas: 76006-33-2) belongs to organobromine compounds.Depending on the type of carbon to which the bromine is bonded, organic bromide could be alkyl, alkenyl, alkynyl, or aryl. Alkyl bromides are mainly used as alkylating agents and also find application as a solvent to extract oil from seeds and wool. Electric Literature of C8H7BrO2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Understanding the Chemoselectivity in Palladium-Catalyzed Three-Component Reaction of o-Bromobenzaldehyde, N-Tosylhydrazone, and Methanol》 was written by Ren, Xiaojian; Zhu, Lei; Yu, Yinghua; Wang, Zhi-Xiang; Huang, Xueliang. COA of Formula: C7H5BrO And the article was included in Organic Letters in 2020. The article conveys some information:

To understand the ligand-controlled palladium-catalyzed coupling of o-bromobenzaldehyde, N-tosylhydrazone, and methanol to give Me 2-benzylbenzoic ester or Me ether, we herein investigated the mechanisms which account for how C-C and C-O bonds are formed and why bidentate dppf/dppb ligands afford ester, whereas P(o-tolyl)3 ligand gives ether. The ester chemoselectivity of the bidentate ligands is attributed to the strong electron-donating effect that disfavors the C,Br-reductive elimination of the coupling intermediate of o-bromobenzaldehyde and N-tosylhydrazone.o-Bromobenzaldehyde(cas: 6630-33-7COA of Formula: C7H5BrO) was used in this study.

o-Bromobenzaldehyde(cas: 6630-33-7) is used in L-threonine aldolase-catalyzed enantio/diastereoselective aldol reactions.COA of Formula: C7H5BrOIt is also used in L-threonine aldolase-catalyzed enantio and diastereoselective aldol reactions. Further, it reacts with trichloromethane to prepare 1-(2-bromo-phenyl)-2,2,2-trichloro-ethanol.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Microwave-assisted unprotected Sonogashira reaction in water for the synthesis of polysubstituted aromatic acetylene compounds》 was written by Tian, Yucheng; Wang, Jubo; Cheng, Xinying; Liu, Kang; Wu, Tizhi; Qiu, Xiaqiu; Kuang, Zijian; Li, Zhiyu; Bian, Jinlei. Product Details of 4316-58-9 And the article was included in Green Chemistry in 2020. The article conveys some information:

A microwave-assisted, efficient and rapid Sonogashira reaction was developed for the synthesis of polysubstituted aromatic alkynes. The reaction was made environmentally friendly and easy to perform by replacing the traditional amine solvents with H2O. The optimized reaction conditions yielded the products with high yields, while reducing the dependence on anaerobic reaction conditions with no inert gas protection. The reaction also achieved the product on the milligram level, overcoming the problem of TMSA volatilization in small-scale reactions. The environmentally friendly reaction solvent, mild reaction conditions, high reaction yields and short reaction time made the reaction highly promising for various applications, especially for synthesizing porous aromatic frameworks. In the experiment, the researchers used many compounds, for example, Tris(4-bromophenyl)amine(cas: 4316-58-9Product Details of 4316-58-9)

In other references, Tris(4-bromophenyl)amine(cas: 4316-58-9) is often used in the synthesis of porous luminescent covalent–organic polymers (COPs)Product Details of 4316-58-9

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Transition-Metal-Free Site-Selective γ-C(sp2)-H Monoiodination of Arenes Directed by an Aliphatic Keto Group》 was written by Bian, Hong-Li; Tang, Shi-Zhong; Chen, Meng-En; Zhang, Xiao-Ming; Lv, Jian-Wei; Chen, Xiao-Wei; Qi, Feng-Ming; Chen, Shi-Wu; Zhang, Fu-Min. Category: bromides-buliding-blocks And the article was included in Organic Letters in 2020. The article conveys some information:

A general γ-C(sp2)-H iodination method directed by an aliphatic keto group has been developed under transition-metal-free conditions for the first time, generating iodoarenes I (X = (CH2)n; n = 0, 1, 2; R = H, 5-bromo, 3,4,5-trimethoxy, etc.; R1 = H, 2-iodophenyl; R2 = H; R1R2 = -CH=CH-CH=CH-), R3C(O)CH(R4)R5 (R3 = Me, Ph, 4-chlorophenyl, etc.; R4 = H, ethyl; R5 = 2-iodophenyl, 2-iodo-4,5-dimethoxyphenyl, 5-chloro-2-iodophenyl, etc.) and 7-(2-iodophenyl)-1,4-dioxaspiro[4.5]decan-8-one in good to excellent yields with excellent site selectivity. This protocol features a wide range of aryl-substituted ketones II, R3C(O)CH(R4)R6 (R6 = Ph, 4-methylphenyl, 4-fluorophenyl, etc.) and 7-phenyl-1,4-dioxaspiro[4.5]decan-8-one, short reaction times, mild reaction conditions, and scalable synthetic procedures. A possible reaction mechanism was also proposed based on several control experiments In the experiment, the researchers used many compounds, for example, 1-Bromo-3,4,5-trimethoxybenzene(cas: 2675-79-8Category: bromides-buliding-blocks)

1-Bromo-3,4,5-trimethoxybenzene(cas: 2675-79-8) is an important raw material and intermediate used in organic synthesis, pharmaceuticals, agrochemicals and dyestuff.Category: bromides-buliding-blocks1-Bromo-3,4,5-trimethoxybenzene can be used to synthesize analogs of HA14-1, which shows promising anticancer properties.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Effects of Tuning Intramolecular Proton Acidity on CO2 Reduction by Mn Bipyridyl Species》 was written by Lense, Sheri; Grice, Kyle A.; Gillette, Kara; Wolf, Lucienna M.; Robertson, Grace; McKeon, Dylan; Saucedo, Cesar; Carroll, Patrick J.; Gau, Michael. COA of Formula: C5BrMnO5 And the article was included in Organometallics in 2020. The article conveys some information:

To understand the effect of intramol. proton acidity on CO2 reduction by Mn-bipyridyl species, three fac-Mn(CO)3 bipyridine complexes containing intramol. phenol groups of varying acidity were synthesized and electrochem., spectroscopic, and computational studies were performed. While the phenol group acidity has minimal influence on the metal center, the complex containing a fluoro-substituted (more acidic) phenol, MnBr(F-HOPh-bpy)(CO)3, exhibits a decreased catalytic to peak current ratio following the 2nd reduction compared to the complexes with unsubstituted or Me-substituted phenol groups (MnBr(HOPh-bpy)(CO)3 and MnBr(Me-HOPh-bpy)(CO)3, resp.). A 2nd process is also present in the catalytic wave for MnBr(F-HOPh-bpy)(CO)3. Also, MnBr(F-HOPh-bpy)(CO)3 exhibits decreased CO2 production and increased H2 production compared to MnBr(HOPh-bpy)(CO)3. Spectroelectrochem. under an inert atm. in the presence of H2O shows that following the 1st reduction, for both MnBr(F-HOPh-bpy)(CO)3 and MnBr(HOPh-bpy)(CO)3 the major product is a phenoxide-coordinated fac-(CO)3 species formed from reductive deprotonation and the minor product is a 6-coordinate Mn(I)-hydride. For both species, the major species following the 2nd reduction is the 5-coordinate anion believed to be the active catalyst for CO2 reduction, but the Mn(I) hydride persists as a minor species. The IR assignments are supported by theor. calculations Changes to the acidity of an intramol. substituent can have significant effects on catalytic performance and product selectivity of Mn(CO)3 bipyridine catalysts despite having minimal effect on the metal center, with a more acidic intramol. substituent increasing H2 production at the expense of CO2 reduction After reading the article, we found that the author used Bromopentacarbonylmanganese(I)(cas: 14516-54-2COA of Formula: C5BrMnO5)

Bromopentacarbonylmanganese(I)(cas: 14516-54-2) has many other uses. It is used in the formation of (eta6-arene)tricarbonylmanganese(I) by reacting with arene (arene= hexamethyl benzene, 1,2,4,5-tetramethyl benzene, mesitylene, p-xylene and toluene) in the presence silver salt.COA of Formula: C5BrMnO5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Gold-Catalyzed Carbazolation Reactions of Alkynes》 was written by Jana, Sripati; He, Feifei; Koenigs, Rene M.. COA of Formula: C12H7Br2N And the article was included in Organic Letters in 2020. The article conveys some information:

Herein, we report on a Au(I)-catalyzed reaction of alkynes with carbazoles that enables a one-step synthesis of vinyl carbazoles that are important mols. for applications as photoluminescent materials. This reaction proceeds under mild conditions at room temperature, without the need of external bases, and can be employed to a variety of aromatic and aliphatic alkynes in monohydroamination and poly-hydroamination reactions. We conclude with photophys. studies of the vinyl carbazole products, which feature distinct fluorescence properties. In addition to this study using 3,6-Dibromo-9H-carbazole, there are many other studies that have used 3,6-Dibromo-9H-carbazole(cas: 6825-20-3COA of Formula: C12H7Br2N) was used in this study.

3,6-Dibromo-9H-carbazole(cas: 6825-20-3) is used as a pharmaceutical intermediate, and also an important intermediate of synthesizing optoelectronic materials. It has been used as a reagent in the synthesis of P7C3-A20 which is a potent neuroprotective agent.COA of Formula: C12H7Br2N

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Kinetic study of the metal-dipeptide complex with ninhydrin facilitated by gemini (m-s-m) surfactant micelles》 was written by Azum, Naved; Kumar, Dileep. SDS of cas: 629-03-8 And the article was included in Scientific Reports in 2020. The article conveys some information:

The three Gemini (m-s-m; m (head group) = 16 and s (spacer) = 4, 5, 6) surfactants have been synthesized and their impact on reaction of zinc(II)-glycylleucine complex ([Zn(II)-Gly-Leu]+) and ninhydrin were studied at temperature (343 K) and pH (5.0) using spectroscopic method. Influence of several factors, viz., [Zn(II)-Gly-Leu]+, [ninhydrin], temperature and pH were also carried out on title reaction in geminis. Rates of reaction are the first-order path in concentration of [Zn(II)-Gly-Leu]+ complex and fractional order path in concentration of ninhydrin. The catalysis of gemini 16-s-16 surfactant micelles was investigated below and above their critical micelle concentration (cmc) value and detailed elaboration were provided in the text. In the present case, rate constants, kψ, increased on increasing geminis ([gemini] are below their cmc, region I) and stayed nearly constant (region II). The shape of (region I and II) surfactants ([gemini] = 0 to 400 × 10-5 mol dm-3) are similar to a cetyltrimethylammonium bromide, CTAB (single hydrophilic head group and hydrophobic part). Later, a sharp increment in rate was observed with higher [gemini] (region III, (Fig. 5)). The study was catalyzed and accelerated quite enough by geminis (at concentrations below their cmc) compared to aqueous An appropriate mechanism has been proposed for accounting for the distribution of reactants between aqueous and micellar pseudo phases. Resulting kinetic data were used to determine the binding constants of micelle-substrate (KB) and micelle-ninhydrin (KNin). The results came from multiple reactions, including the reaction of 1,6-Dibromohexane(cas: 629-03-8SDS of cas: 629-03-8)

1,6-Dibromohexane(cas: 629-03-8) is generally used to introduce C6 spacer in the molecular architecture. Some of the examples are: synthesis of solvent processable and conductive polyfluorene ionomers for alkaline fuel cell applications; synthesis of cross-linkable regioregular poly(3-(5-hexenyl)thiophene) (P3HNT) for stabilizing the film morphology in polymer photovoltaic cells.SDS of cas: 629-03-8

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《An efficient hydrogenation catalytic model hosted in a stable hyper-crosslinked porous-organic-polymer: from fatty acid to bio-based alkane diesel synthesis》 was published in Green Chemistry in 2020. These research results belong to Sarkar, Chitra; Shit, Subhash Chandra; Dao, Duy Quang; Lee, Jihyeon; Tran, Ngoc Han; Singuru, Ramana; An, Kwangjin; Nguyen, Dang Nam; Le, Quyet Van; Amaniampong, Prince Nana; Drif, Asmaa; Jerome, Francois; Huyen, Pham Thanh; Phan, Thi To Nga; Vo, Dai-Viet N.; Nguyen, Thanh Binh; Trinh, Quang Thang; Sherburne, Matthew P.; Mondal, John. Name: 1,4-Bis(bromomethyl)benzene The article mentions the following:

In this study, a Pd-based catalytic model over a nitrogen enriched fibrous Porous-Organic-Polymer (POP) is established to execute hydrodeoxygenation of various vegetable oils in producing potential large-scale renewable diesel. Here we report a cost-effective synthesis strategy for a new microporous hypercrosslinked POP through the FeCl3 assisted Friedel-Crafts alkylation reaction, followed by fabrication of Pd0-NPs (2-3 nm) using a solid gas phase hydrogenation route to deliver a novel catalytic system. This catalyst (called Pd@PPN) exhibits versatile catalytic performance for different types of vegetable oils including palm oil, soybean oil, sunflower oil and rapeseed oil to furnish long chain diesel range alkanes. The catalyst is comprehensively characterized using various spectroscopic tools and it shows high stability during five runs of recycling without leaching of Pd. Our results further reveal that a direct decarbonylation (DCN) pathway of fatty acids to produce alkanes with one fewer carbon is the dominant mechanism. Under optimized conditions, using stearic acid to represent the long linear carboxylic acids in the vegetable oils, up to 90% conversion with 83% selectivity of C17-alkane has been achieved on our fabricated catalyst. D. functional theory (DFT) calculations are performed to provide insights into the electronic properties of the catalyst, the mechanistic reaction pathway, the crucial role of the catalyst surface and the product selectivity trend. The strong interaction between the corrugated polymer-frame-structure and the Pd-NPs suggests the presence of high d. step sites on the fabricated Pd-NP anchored within the cage of the polymer structure. DFT calculations also reveal the strong promotional effect of step sites and charge transfer in facilitating rate-limiting steps during the decarbonylation (DCN) pathway and removal of strongly bound intermediates formed during the process, therefore explaining the high activity of the fabricated Pd@PPN catayst for the hydrodeoxygenation (HDO) conversion to produce bio-based alkane diesel. In the experimental materials used by the author, we found 1,4-Bis(bromomethyl)benzene(cas: 623-24-5Name: 1,4-Bis(bromomethyl)benzene)

1,4-Bis(bromomethyl)benzene(cas: 623-24-5) belongs to organobromine compounds.Depending on the type of carbon to which the bromine is bonded, organic bromide could be alkyl, alkenyl, alkynyl, or aryl. Dehydrobromination, Grignard reactions, reductive coupling, Wittig reaction, and several nucleophilic substitution reactions are some of the principal reactions which involve organic bromides. Name: 1,4-Bis(bromomethyl)benzene

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary